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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Sidney Olson | 1.476 | 2055 | |
| 2 | Felipe Salazar | 1.594 | 2079 | |
| 3 | Domingo García | 1.609 | 2041 | |
| 4 | Eugene McCann | 1.651 | 2085 | |
| 5 | Albert Long# | 1.665 | 2090 | |
| 6 | Dinis Camanho | 1.674 | 2053 | |
| 7 | Dennis Sanders | 1.704 | 2037 | |
| 8 | José Velásquez | 1.833 | 2053 | |
| 9 | Old Nick Bradley | 1.835 | 2059 | |
| 10 | Lewis Thompson | 1.847 | 2042 | |
| 11 | Red Daniels | 1.862 | 2041 | |
| 12 | Arturo Gonzáles | 1.876 | 2037 | |
| 13 | Shawn Walker | 1.881 | 2040 | |
| 14 | Fred Justice# | 1.900 | 2092 | |
| 15 | Anthony Raymond | 1.904 | 2062 | |
| 16 | Tomás Ramírez# | 1.911 | 2093 | |
| 17 | José Metia# | 1.922 | 2089 | |
| 17 | Marty Richardson | 1.922 | 2040 | |
| 19 | Roberto Juárez | 1.924 | 2034 | |
| 20 | Andrew Phillips | 1.926 | 2062 | |
| 21 | Félix Torres | 1.933 | 2057 | |
| 22 | Ángel Álvarez | 1.953 | 2075 | |
| 23 | Alonso Concepción | 1.957 | 2035 | |
| 24 | António Sánchez | 1.959 | 2075 | |
| 25 | Craig Rorison | 1.963 | 2076 | |
| 26 | Jorge Ruíz# | 1.976 | 2094 | |
| 27 | Juan Pagán | 1.977 | 2053 | |
| 28 | Elias Paulson | 1.978 | 2032 | |
| 29 | Jorge Moreno | 1.990 | 2041 | |
| 30 | Dave Pace | 1.993 | 2077 | |
| 31 | Lúcio Mejía | 2.011 | 2073 | |
| 31 | José Colón# | 2.011 | 2086 | |
| 33 | Juan Toro# | 2.014 | 2092 | |
| 34 | Roberto Serrano | 2.015 | 2066 | |
| 35 | Zachary Miller | 2.046 | 2048 | |
| 36 | Ka-byong Pak | 2.059 | 2053 | |
| 37 | Sergio Yánez | 2.080 | 2065 | |
| 38 | Ramón Orozco# | 2.084 | 2092 | |
| 38 | Jeffrey McNiter | 2.084 | 2039 | |
| 40 | Eduardo Barras | 2.088 | 2034 | |
| 41 | Salvador Barona | 2.089 | 2037 | |
| 42 | Ian Lewis# | 2.094 | 2087 | |
| 43 | Gustavo Jiménez | 2.099 | 2044 | |
| 43 | Pedro Romano# | 2.099 | 2094 | |
| 45 | Júlio Pérez | 2.106 | 2068 | |
| 46 | Herb Little# | 2.112 | 2095 | |
| 47 | Gabriel Vega | 2.113 | 2070 | |
| 48 | Dale McCormick# | 2.116 | 2094 | |
| 49 | Rick McGrath | 2.126 | 2038 | |
| 50 | Ron Holloway | 2.127 | 2036 | |
| 51 | George Smith# | 2.128 | 2093 | |
| 52 | Ed Davis | 2.130 | 2062 | |
| 53 | Tony Gutiérrez | 2.137 | 2064 | |
| 54 | Scot Chapman | 2.139 | 2064 | |
| 54 | José Orozco# | 2.139 | 2090 | |
| 56 | José Ortíz | 2.143 | 2050 | |
| 57 | Nate Salinas | 2.146 | 2078 | |
| 58 | Miguel González# | 2.150 | 2094 | |
| 59 | Chad Barnes | 2.151 | 2036 | |
| 60 | Manuel de la Cruz | 2.160 | 2035 | |
| 60 | Derrick Rocha | 2.160 | 2071 | |
| 62 | Liam Green | 2.162 | 2057 | |
| 62 | Alan Stone | 2.162 | 2077 | |
| 64 | Carter Folsom | 2.164 | 2046 | |
| 65 | Greg Kirby | 2.173 | 2077 | |
| 66 | Greg Robbins | 2.174 | 2084 | |
| 67 | Santiago Morales | 2.184 | 2041 | |
| 68 | Cory Cost | 2.187 | 2033 | |
| 69 | Dan McCulley# | 2.189 | 2095 | |
| 70 | Alfredo Gramajo | 2.193 | 2069 | |
| 71 | Scott Thompson | 2.196 | 2040 | |
| 71 | Tim Robinson | 2.196 | 2032 | |
| 73 | Ben Turner | 2.203 | 2079 | |
| 74 | Ánibal Ortíz | 2.206 | 2084 | |
| 75 | Loren Ortíz# | 2.208 | 2094 | |
| 76 | Felipe Ocampo | 2.209 | 2040 | |
| 77 | John Wilson# | 2.216 | 2094 | |
| 78 | José Alvarado | 2.220 | 2060 | |
| 79 | Bill Gillespie | 2.225 | 2059 | |
| 80 | Tim Bergeron# | 2.227 | 2087 | |
| 81 | Edward Carrell | 2.230 | 2033 | |
| 82 | Fernando Avalos# | 2.231 | 2091 | |
| 83 | Derek Warren# | 2.233 | 2089 | |
| 84 | Bill Wyma | 2.237 | 2035 | |
| 85 | Eddie Lang | 2.238 | 2090 | |
| 86 | Travis Allen | 2.239 | 2062 | |
| 87 | Victor Gregory# | 2.240 | 2087 | |
| 88 | Luis Cruz# | 2.241 | 2090 | |
| 89 | Jorge Moreno | 2.242 | 2039 | |
| 90 | Julián Leal | 2.246 | 2058 | |
| 91 | Anthony Green# | 2.255 | 2092 | |
| 91 | Felipe López | 2.255 | 2054 | |
| 91 | Santiago Torres# | 2.255 | 2090 | |
| 94 | Pedro Romano# | 2.259 | 2092 | |
| 94 | León Hernández# | 2.259 | 2088 | |
| 96 | Nick Nelson | 2.260 | 2077 | |
| 97 | John Davis | 2.262 | 2039 | |
| 97 | Juan Ávila# | 2.262 | 2079 | |
| 99 | Juan Ávila# | 2.265 | 2080 | |
| 100 | Felipe Ocampo | 2.269 | 2038 |
